Improvement in stove-pipe joints



UNITED STATES PATENT OFFICE.

GEORGE D. UMLAND, OF OSOEOLA MILLS, WISCONSIN.

IMPROVEMENT IN STOVE-PIPE JOINTS.

Specification forming part of Letters Patent No. 165,893, dated July 20, 1875; application filed March 29, 1875.

To all whom it may concern:

Be it known that I, GEORGE D. UMLAND, of Osceola Mills, in the county of Polk and State of WVisconsin, have invented a new and useful I mprovement-in Self-Supporting Stove- Pipe Joints, of which the following is a speci-' fication:

The object of this invention is to render the pipes of stoves and other heating-furnaces less dangerous than they now are, and to make them so that they cannot work or be pulled apart when once put together; and it consists in spiral beads or grooves made to fit each other, so that the two parts may be put together by revolving either one.

Figure 1 is a side view, showing the mode of putting the two joints together. Fig. 2. is a longitudinal section of Fig. 1. Fig. 3 is a view of a joint of pipe, showing more plainly the construction, thejoint being shown in the plate before forming it into pipe.

Similar letters of reference indicate corresponding parts.

A represents the pipe. B and (J are the corrugations or grooves and beads. In the section, Fig. 3, the groove is on the outer and the head on the inner joints. The grooves are made on both ends of the joint, and the beads are made informing the grooves, the two being identical in form on each end of each joint, the two fitting together similar to gaspipe by screwing or revolving either length. ()ne thread or circle is sufficient to support the pipe, but there may be more. The interior pipes D are smaller at the ends, so as to readily enter the exterior pipe, as seen in Figs. 1 and 2. The blank A has edge strips E E, that form the lock shown in Fig. l of drawing, and the notches E E shown in Fig. 3,

Witnesses:

OARLEs MEIERHOFF, J OHN H. BAKER. 

